Editing DBm (section)

==Unit conversions==
A power level of 0&nbsp;dBm corresponds to a power of 1 milliwatt. A 10&nbsp;dB increase in level is equivalent to a ten-fold increase in power. Therefore, a 20&nbsp;dB increase in level is equivalent to a 100-fold increase in power. A 3&nbsp;dB increase in level is approximately equivalent to doubling the power, which means that a level of 3&nbsp;dBm corresponds roughly to a power of 2&nbsp;mW. Similarly, for each 3&nbsp;dB decrease in level, the power is reduced by about one half, making −3&nbsp;dBm correspond to a power of about 0.5&nbsp;mW.

To express an arbitrary power {{mvar|P}} in mW as {{mvar|x}} in dBm, the following expression may be used:<ref>{{cite book |last=Sobot |first=Robert |title=Wireless Communication Electronics: Introduction to RF Circuits and Design |publisher=Springer |date=2012 |page=252 |isbn=9783030486303 |url=https://books.google.com/books?id=pdX-DwAAQBAJ&pg=PA252}}</ref>
<math display="block">\begin{align}
 x &= 10 \log_{10} \frac{P}{1~\text{mW}}
\end{align}</math>
Conversely, to express an arbitrary power level {{mvar|x}} in dBm, as {{mvar|P}} in mW:
<math display="block">\begin{align}
 P &= 1~\text{mW} \cdot 10^{\frac{x}{10}}
\end{align}</math>